For the function
,
find all intervals where the function is increasing.
is increasing on (Give your answer as an interval or a list of intervals,
e.g.,(-infinity,8]or(1,5),(7,10). Enter none
if there are no such intervals.)

Similarly, find all intervals where the function is decreasing:
is decreasing on (Give your answer as an interval or a list of intervals,
e.g.,(-infinity,8]or(1,5),(7,10). Enter none
if there are no such intervals.)

Finally, find all critical points in the graph of
(enter values as a comma-separated list, or none
if there are no critical points):